Python modify all the files in the directory prefix

Because usually lazy, so the file mess. Sometimes when people want something. In order to add some of his own signature it is quite troublesome. On smoothly write a simple batch file prefix to modify a small demo.

code show as below:

# --** coding="UTF-8" **--

import os

def renameFileNames(filepath,prefix):
    if not os.path.exists(filepath):
        print("目录不存在!!")
    filenames = os.listdir(filepath)
    for data in filenames:

        if (os.path.isfile(os.path.join(filepath,data))):
            #增加前缀os.rename(os.path.join(filepath,data),os.path.join(filepath,prefix+data[3:]))

        elif(os.path.isdir(os.path.join(filepath,data))):
            renameFileNames(os.path.join(filepath,data))

if __name__ == "__main__":
    filepath = "E:\\"
    prefi = "前缀"
    print("start")
    if not os.path.exists(filepath,prefix):
        print("目录不存在!!")
        os._exit(1)
    renameFileNames(filepath)